elapsedDays

function elapsedDays(p_strDate)
{
    const dt1 = new Date(p_strDate);
    const dtNow = new Date(Date.now());
    const intMSPerDay = 1000 * 60 * 60 * 24;
    const diffInTime = dtNow.getTime() - dt1.getTime();
    return diffInDays = Math.round(diffInTime / intMSPerDay);
}

elapsedDays("2021-11-30" );